Date: Mon, 12 Mar 2001 23:20:46 GMT From: "J.Goodleaf" <john@goodleaf.net> To: stable@FreeBSD.ORG Subject: Re: Disk I/O problem in 4.3-BETA Message-ID: <20010312232046.D24215C09@clyde.goodleaf.net> In-Reply-To: <20010312140636.A18351@fw.wintelcom.net> References: <200103122036.VAA99695@freebsd.dk> <200103122146.f2CLkLs08952@ptavv.es.net> <20010312140636.A18351@fw.wintelcom.net>
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I don't adequately understand the difference between what you're talking about here and what softupdates does. I have used softupdates for some time, but now I'm nervous! Can you point me toward the nearest info source, that I might RTFM and refrain from bugging you guys? (Given that I already tried man softupdates and man tunefs doesn't tell me anything.) -J Alfred Perlstein writes: > * Kevin Oberman <oberman@es.net> [010312 13:46] wrote: >> Soren, >> >> Thanks for the quick reply! And right on the button, too. >> >> I have turned the write cache back on (any relevance to "write cache" >> being abbreviated to "WC"? :-) and the time to dd the slices went back >> to 10 and 5 minutes (actually 489 and 287 seconds). >> >> How serious is the possible corruption issue, anyway. The loss in >> performance is pretty drastic although it may be that dd is an >> especially bad case, but I really don't like to corrupt my disks, >> either. > > If basically running with blind write caching turned on is akin to > running your filesystem in async mode. This is because write > caching gives the drive license to lie about completing a write, > the various ordering of writes are effectively bypassed. If you > crash without these dependancies actually written to the disk, when > you come back up you have a good chance of losing large portions > of your filesystem. > > -- > -Alfred Perlstein - [bright@wintelcom.net|alfred@freebsd.org] > Daemon News Magazine in your snail-mail! http://magazine.daemonnews.org/ > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-stable" in the body of the message _____________________________ | J. Goodleaf | | | / ) | Technology Coordinator | / / | FreeBSD Advocate | ( ( | email ==> | (((\ \> |/ ) john@goodleaf.net | (\\\\ \_/ /_________________________| \ / \ _/ / / / / To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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